Air filter case



FIG. 1 is a bottom plan view of an air filter case showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof, the rear being identical in appearance; and,

FIG. 6 is a top, front and right side perspective view thereof. 

The ornamental design for an air filter case, as shown and described. 